Submission #1147335

#	Time	Username	Problem	Language	Result	Execution time	Memory
1147335		aldo2902	Coin Collecting (JOI19_ho_t4)	Pypy 3	Compilation error	0 ms	0 KiB

joi2019_ho_t4

import java.util.*;

public class CoinCollecting {
    
    private static final int[][] DIRECTIONS = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
    
    public static int bfs(int[] start, int[] target) {
        Queue<int[]> queue = new LinkedList<>();
        Set<String> visited = new HashSet<>();
        
        queue.add(new int[]{start[0], start[1], 0}); // {x, y, distancia}
        visited.add(start[0] + "," + start[1]);
        
        while (!queue.isEmpty()) {
            int[] current = queue.poll();
            int x = current[0], y = current[1], dist = current[2];
            
            if (x == target[0] && y == target[1]) {
                return dist;
            }
            
            for (int[] dir : DIRECTIONS) {
                int nx = x + dir[0];
                int ny = y + dir[1];
                String key = nx + "," + ny;
                
                if (!visited.contains(key)) {
                    visited.add(key);
                    queue.add(new int[]{nx, ny, dist + 1});
                }
            }
        }
        return Integer.MAX_VALUE;
    }
    
    public static int solveCoinCollecting(int N, List<int[]> coinPositions) {
        List<int[]> targets = new ArrayList<>();
        for (int x = 1; x <= N; x++) {
            for (int y = 1; y <= 2; y++) {
                targets.add(new int[]{x, y});
            }
        }
        
        int totalMoves = 0;
        Set<String> usedTargets = new HashSet<>();
        
        for (int[] coin : coinPositions) {
            int minMoves = Integer.MAX_VALUE;
            int[] bestTarget = null;
            
            for (int[] target : targets) {
                String targetKey = target[0] + "," + target[1];
                if (!usedTargets.contains(targetKey)) {
                    int moves = bfs(coin, target);
                    if (moves < minMoves) {
                        minMoves = moves;
                        bestTarget = target;
                    }
                }
            }
            
            totalMoves += minMoves;
            if (bestTarget != null) {
                usedTargets.add(bestTarget[0] + "," + bestTarget[1]);
            }
        }
        
        return totalMoves;
    }
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        List<int[]> coinPositions = new ArrayList<>();
        
        for (int i = 0; i < 2 * N; i++) {
            int x = scanner.nextInt();
            int y = scanner.nextInt();
            coinPositions.add(new int[]{x, y});
        }
        
        int result = solveCoinCollecting(N, coinPositions);
        System.out.println(result);
        
        scanner.close();
    }
}

Compilation message (stdout)

Compiling 'joi2019_ho_t4.py'...
***   File "joi2019_ho_t4.py", line 14
    while (!queue.isEmpty()) {
           ^
SyntaxError: Unknown character


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